99638233 has 2 divisors, whose sum is σ = 99638234. Its totient is φ = 99638232.

The previous prime is 99638221. The next prime is 99638243. The reversal of 99638233 is 33283699.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 62220544 + 37417689 = 7888^2 + 6117^2 .

It is an emirp because it is prime and its reverse (33283699) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-99638233 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 99638233.

It is not a weakly prime, because it can be changed into another prime (99638213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49819116 + 49819117.

It is an arithmetic number, because the mean of its divisors is an integer number (49819117).

Almost surely, 2^99638233 is an apocalyptic number.

It is an amenable number.

99638233 is a deficient number, since it is larger than the sum of its proper divisors (1).

99638233 is an equidigital number, since it uses as much as digits as its factorization.

99638233 is an evil number, because the sum of its binary digits is even.

The product of its digits is 209952, while the sum is 43.

The square root of 99638233 is about 9981.8952609211. The cubic root of 99638233 is about 463.5984824793.

The spelling of 99638233 in words is "ninety-nine million, six hundred thirty-eight thousand, two hundred thirty-three".